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arXiv 2603.13656astro-ph.GA
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在SFACT调查中发现的恒星形成星系的环境:合并和相互作用是否驱动恒星形成?

The Environments of Star-Forming Galaxies Detected in the SFACT Survey: Do Mergers and Interactions Drive the Star Formation?

Indiana University(印第安纳大学)

Brooke Kimsey-Miller, John J. Salzer, Kristin N. Baker, Samantha W. Brunker, David J. Carr, Jennifer Sieben

AI总结:

研究分析了167个恒星形成星系的环境,发现其集群强度低于对照样本,恒星形成率与绝对光度相关,合并和相互作用并非主要驱动因素。

摘要:

我们对红移范围0.129≤z≤0.500内通过SFACT调查发现的167个恒星形成星系(SFGs)周围环境进行了分析。我们使用三种环境估计量来表征SFACT SFGs周围的局部银河环境,尺度为100kpc到数Mpc。我们根据相对于深环境对照样本的相对聚类强度对这些环境进行分类。SFACT SFGs比环境对照样本(ECS)更不聚类,我们的红移范围内相对聚类强度没有显著变化。我们发现SFACT星系及其环境的恒星形成率(SFRs)的趋势很可能与它们的绝对光度有关,这是质量的代理。合并和与其它明亮星系的相互作用似乎不是SFACT SFGs中观察到的恒星形成活动的主要驱动力。

英文摘要:

We conduct an environmental analysis around 167 star-forming galaxies (SFGs) detected by the Star Formation Across Cosmic Time (SFACT) survey over the redshift range 0.129 $\leq$ z $\leq$ 0.500. We use three environmental estimators to characterize the local galactic environments around the SFACT SFGs, on the scales of 100 kpc to several Mpc. We categorize these environments based on the relative clustering strength with respect to a deep environment comparison redshift sample. The SFACT SFGs tend to be less clustered than the environment comparison sample (ECS), with no significant change in relative clustering strengths over our redshift range. We find that any trends with the star-formation rates (SFRs) of the SFACT galaxies and their environments are likely related to their absolute magnitudes, a proxy for mass. Mergers and interactions with other luminous galaxies do not appear to be the primary driver of the star-formation activity seen within the SFACT SFGs.

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